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Can PGP 2.6 interoperate with previous versions of PGP?

April 26, 2017interoperate PGP previous versions

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Can PGP 2.6 interoperate with previous versions of PGP?

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Not completely. There are two different incompatibilities between PGP 2.6 and earlier versions of PGP. The first incompatibility is a deliberate format change that will trigger on September 1, 1994. The intent of this change is to discourage PGP users in the U.S. from using PGP 2.3a, which potentially infringes patents. The second incompatibility is that PGP 2.6 requires signatures to be in PKCS format, which has been the default since PGP 2.3, although PGP 2.3 was able to process non-PKCS signatures.